It's okay, stay calm. We understand and have been there.
Every child develops at a different stage. Girls have a tendency to use the inability to go potty for attention more than boys. They are so smart.
I did this with my son from the advice of a successful potty trainer, not sure it will work for girls or not, but a thought to help.
The advice was: let them run around buck naked in the back yard. They will get used to feeling their bodies alert them they have to pee and react at that time, also giving them the power, knowledge to know how to react w/o soiling the house.
It worked like a charm for us - my neighbor has same age child and didn't do it. When my son was going potty, her was still pooping in his cowboy boots. No thank you!
Also use the thick potty training cotton pants and be prepared to throw a few away. Sorry - the poopy ones don't get saved.
Let her control it more herself. Always set the timer to remind yourself to guide her to the potty every hour or two. If she says no I don't have to, encourage but don't force. If she has an accident, that is her error. She won't like it after awhile.
Don't scold, don't degrade no matter how disgusting or upsetting it will be. Negative attention is as good as good attention.
I agree, no more diapers. Bed time still use pull ups though - still too young for nothing. 50% of kids wet one time or another even after 6 months of dry.
Hang in there. You will survive this. Stay positive and you will feel better.
Remember, when she does go potty correctly or stays dry, make a really big deal out of it with verbal and physical praise. :)
Hugs to you both, C.